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Save sram context after changing MPU, DSP or core clocks
[linux-ginger.git] / drivers / ieee1394 / dv1394.c
blob2cd00b5b45b464ddf60d9862d3178b51660a634a
1 /*
2 * dv1394.c - DV input/output over IEEE 1394 on OHCI chips
3 * Copyright (C)2001 Daniel Maas <dmaas@dcine.com>
4 * receive by Dan Dennedy <dan@dennedy.org>
5 *
6 * based on:
7 * video1394.c - video driver for OHCI 1394 boards
8 * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24
25 /*
26 OVERVIEW
27
28 I designed dv1394 as a "pipe" that you can use to shoot DV onto a
29 FireWire bus. In transmission mode, dv1394 does the following:
30
31 1. accepts contiguous frames of DV data from user-space, via write()
32 or mmap() (see dv1394.h for the complete API)
33 2. wraps IEC 61883 packets around the DV data, inserting
34 empty synchronization packets as necessary
35 3. assigns accurate SYT timestamps to the outgoing packets
36 4. shoots them out using the OHCI card's IT DMA engine
37
38 Thanks to Dan Dennedy, we now have a receive mode that does the following:
39
40 1. accepts raw IEC 61883 packets from the OHCI card
41 2. re-assembles the DV data payloads into contiguous frames,
42 discarding empty packets
43 3. sends the DV data to user-space via read() or mmap()
44 */
45
46 /*
47 TODO:
48
49 - tunable frame-drop behavior: either loop last frame, or halt transmission
50
51 - use a scatter/gather buffer for DMA programs (f->descriptor_pool)
52 so that we don't rely on allocating 64KB of contiguous kernel memory
53 via pci_alloc_consistent()
54
55 DONE:
56 - during reception, better handling of dropped frames and continuity errors
57 - during reception, prevent DMA from bypassing the irq tasklets
58 - reduce irq rate during reception (1/250 packets).
59 - add many more internal buffers during reception with scatter/gather dma.
60 - add dbc (continuity) checking on receive, increment status.dropped_frames
61 if not continuous.
62 - restart IT DMA after a bus reset
63 - safely obtain and release ISO Tx channels in cooperation with OHCI driver
64 - map received DIF blocks to their proper location in DV frame (ensure
65 recovery if dropped packet)
66 - handle bus resets gracefully (OHCI card seems to take care of this itself(!))
67 - do not allow resizing the user_buf once allocated; eliminate nuke_buffer_mappings
68 - eliminated #ifdef DV1394_DEBUG_LEVEL by inventing macros debug_printk and irq_printk
69 - added wmb() and mb() to places where PCI read/write ordering needs to be enforced
70 - set video->id correctly
71 - store video_cards in an array indexed by OHCI card ID, rather than a list
72 - implement DMA context allocation to cooperate with other users of the OHCI
73 - fix all XXX showstoppers
74 - disable IR/IT DMA interrupts on shutdown
75 - flush pci writes to the card by issuing a read
76 - character device dispatching
77 - switch over to the new kernel DMA API (pci_map_*()) (* needs testing on platforms with IOMMU!)
78 - keep all video_cards in a list (for open() via chardev), set file->private_data = video
79 - dv1394_poll should indicate POLLIN when receiving buffers are available
80 - add proc fs interface to set cip_n, cip_d, syt_offset, and video signal
81 - expose xmit and recv as separate devices (not exclusive)
82 - expose NTSC and PAL as separate devices (can be overridden)
83
84 */
85
86 #include <linux/kernel.h>
87 #include <linux/list.h>
88 #include <linux/slab.h>
89 #include <linux/interrupt.h>
90 #include <linux/wait.h>
91 #include <linux/errno.h>
92 #include <linux/module.h>
93 #include <linux/init.h>
94 #include <linux/pci.h>
95 #include <linux/fs.h>
96 #include <linux/poll.h>
97 #include <linux/mutex.h>
98 #include <linux/bitops.h>
99 #include <asm/byteorder.h>
100 #include <asm/atomic.h>
101 #include <asm/io.h>
102 #include <asm/uaccess.h>
103 #include <linux/delay.h>
104 #include <asm/pgtable.h>
105 #include <asm/page.h>
106 #include <linux/sched.h>
107 #include <linux/types.h>
108 #include <linux/vmalloc.h>
109 #include <linux/string.h>
110 #include <linux/compat.h>
111 #include <linux/cdev.h>
112
113 #include "dv1394.h"
114 #include "dv1394-private.h"
115 #include "highlevel.h"
116 #include "hosts.h"
117 #include "ieee1394.h"
118 #include "ieee1394_core.h"
119 #include "ieee1394_hotplug.h"
120 #include "ieee1394_types.h"
121 #include "nodemgr.h"
122 #include "ohci1394.h"
123
124 /* DEBUG LEVELS:
125 0 - no debugging messages
126 1 - some debugging messages, but none during DMA frame transmission
127 2 - lots of messages, including during DMA frame transmission
128 (will cause undeflows if your machine is too slow!)
129 */
130
131 #define DV1394_DEBUG_LEVEL 0
132
133 /* for debugging use ONLY: allow more than one open() of the device */
134 /* #define DV1394_ALLOW_MORE_THAN_ONE_OPEN 1 */
135
136 #if DV1394_DEBUG_LEVEL >= 2
137 #define irq_printk( args... ) printk( args )
138 #else
139 #define irq_printk( args... ) do {} while (0)
140 #endif
141
142 #if DV1394_DEBUG_LEVEL >= 1
143 #define debug_printk( args... ) printk( args)
144 #else
145 #define debug_printk( args... ) do {} while (0)
146 #endif
147
148 /* issue a dummy PCI read to force the preceding write
149 to be posted to the PCI bus immediately */
150
151 static inline void flush_pci_write(struct ti_ohci *ohci)
152 {
153 mb();
154 reg_read(ohci, OHCI1394_IsochronousCycleTimer);
155 }
156
157 static void it_tasklet_func(unsigned long data);
158 static void ir_tasklet_func(unsigned long data);
159
160 #ifdef CONFIG_COMPAT
161 static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
162 unsigned long arg);
163 #endif
164
165 /* GLOBAL DATA */
166
167 /* list of all video_cards */
168 static LIST_HEAD(dv1394_cards);
169 static DEFINE_SPINLOCK(dv1394_cards_lock);
170
171 /* translate from a struct file* to the corresponding struct video_card* */
172
173 static inline struct video_card* file_to_video_card(struct file *file)
174 {
175 return (struct video_card*) file->private_data;
176 }
177
178 /*** FRAME METHODS *********************************************************/
179
180 static void frame_reset(struct frame *f)
181 {
182 f->state = FRAME_CLEAR;
183 f->done = 0;
184 f->n_packets = 0;
185 f->frame_begin_timestamp = NULL;
186 f->assigned_timestamp = 0;
187 f->cip_syt1 = NULL;
188 f->cip_syt2 = NULL;
189 f->mid_frame_timestamp = NULL;
190 f->frame_end_timestamp = NULL;
191 f->frame_end_branch = NULL;
192 }
193
194 static struct frame* frame_new(unsigned int frame_num, struct video_card *video)
195 {
196 struct frame *f = kmalloc(sizeof(*f), GFP_KERNEL);
197 if (!f)
198 return NULL;
199
200 f->video = video;
201 f->frame_num = frame_num;
202
203 f->header_pool = pci_alloc_consistent(f->video->ohci->dev, PAGE_SIZE, &f->header_pool_dma);
204 if (!f->header_pool) {
205 printk(KERN_ERR "dv1394: failed to allocate CIP header pool\n");
206 kfree(f);
207 return NULL;
208 }
209
210 debug_printk("dv1394: frame_new: allocated CIP header pool at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
211 (unsigned long) f->header_pool, (unsigned long) f->header_pool_dma, PAGE_SIZE);
212
213 f->descriptor_pool_size = MAX_PACKETS * sizeof(struct DMA_descriptor_block);
214 /* make it an even # of pages */
215 f->descriptor_pool_size += PAGE_SIZE - (f->descriptor_pool_size%PAGE_SIZE);
216
217 f->descriptor_pool = pci_alloc_consistent(f->video->ohci->dev,
218 f->descriptor_pool_size,
219 &f->descriptor_pool_dma);
220 if (!f->descriptor_pool) {
221 pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
222 kfree(f);
223 return NULL;
224 }
225
226 debug_printk("dv1394: frame_new: allocated DMA program memory at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
227 (unsigned long) f->descriptor_pool, (unsigned long) f->descriptor_pool_dma, f->descriptor_pool_size);
228
229 f->data = 0;
230 frame_reset(f);
231
232 return f;
233 }
234
235 static void frame_delete(struct frame *f)
236 {
237 pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
238 pci_free_consistent(f->video->ohci->dev, f->descriptor_pool_size, f->descriptor_pool, f->descriptor_pool_dma);
239 kfree(f);
240 }
241
242
243
244
245 /*
246 frame_prepare() - build the DMA program for transmitting
247
248 Frame_prepare() must be called OUTSIDE the video->spinlock.
249 However, frame_prepare() must still be serialized, so
250 it should be called WITH the video->mtx taken.
251 */
252
253 static void frame_prepare(struct video_card *video, unsigned int this_frame)
254 {
255 struct frame *f = video->frames[this_frame];
256 int last_frame;
257
258 struct DMA_descriptor_block *block;
259 dma_addr_t block_dma;
260 struct CIP_header *cip;
261 dma_addr_t cip_dma;
262
263 unsigned int n_descriptors, full_packets, packets_per_frame, payload_size;
264
265 /* these flags denote packets that need special attention */
266 int empty_packet, first_packet, last_packet, mid_packet;
267
268 __le32 *branch_address, *last_branch_address = NULL;
269 unsigned long data_p;
270 int first_packet_empty = 0;
271 u32 cycleTimer, ct_sec, ct_cyc, ct_off;
272 unsigned long irq_flags;
273
274 irq_printk("frame_prepare( %d ) ---------------------\n", this_frame);
275
276 full_packets = 0;
277
278
279
280 if (video->pal_or_ntsc == DV1394_PAL)
281 packets_per_frame = DV1394_PAL_PACKETS_PER_FRAME;
282 else
283 packets_per_frame = DV1394_NTSC_PACKETS_PER_FRAME;
284
285 while ( full_packets < packets_per_frame ) {
286 empty_packet = first_packet = last_packet = mid_packet = 0;
287
288 data_p = f->data + full_packets * 480;
289
290 /************************************************/
291 /* allocate a descriptor block and a CIP header */
292 /************************************************/
293
294 /* note: these should NOT cross a page boundary (DMA restriction) */
295
296 if (f->n_packets >= MAX_PACKETS) {
297 printk(KERN_ERR "dv1394: FATAL ERROR: max packet count exceeded\n");
298 return;
299 }
300
301 /* the block surely won't cross a page boundary,
302 since an even number of descriptor_blocks fit on a page */
303 block = &(f->descriptor_pool[f->n_packets]);
304
305 /* DMA address of the block = offset of block relative
306 to the kernel base address of the descriptor pool
307 + DMA base address of the descriptor pool */
308 block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
309
310
311 /* the whole CIP pool fits on one page, so no worries about boundaries */
312 if ( ((unsigned long) &(f->header_pool[f->n_packets]) - (unsigned long) f->header_pool)
313 > PAGE_SIZE) {
314 printk(KERN_ERR "dv1394: FATAL ERROR: no room to allocate CIP header\n");
315 return;
316 }
317
318 cip = &(f->header_pool[f->n_packets]);
319
320 /* DMA address of the CIP header = offset of cip
321 relative to kernel base address of the header pool
322 + DMA base address of the header pool */
323 cip_dma = (unsigned long) cip % PAGE_SIZE + f->header_pool_dma;
324
325 /* is this an empty packet? */
326
327 if (video->cip_accum > (video->cip_d - video->cip_n)) {
328 empty_packet = 1;
329 payload_size = 8;
330 video->cip_accum -= (video->cip_d - video->cip_n);
331 } else {
332 payload_size = 488;
333 video->cip_accum += video->cip_n;
334 }
335
336 /* there are three important packets each frame:
337
338 the first packet in the frame - we ask the card to record the timestamp when
339 this packet is actually sent, so we can monitor
340 how accurate our timestamps are. Also, the first
341 packet serves as a semaphore to let us know that
342 it's OK to free the *previous* frame's DMA buffer
343
344 the last packet in the frame - this packet is used to detect buffer underflows.
345 if this is the last ready frame, the last DMA block
346 will have a branch back to the beginning of the frame
347 (so that the card will re-send the frame on underflow).
348 if this branch gets taken, we know that at least one
349 frame has been dropped. When the next frame is ready,
350 the branch is pointed to its first packet, and the
351 semaphore is disabled.
352
353 a "mid" packet slightly before the end of the frame - this packet should trigger
354 an interrupt so we can go and assign a timestamp to the first packet
355 in the next frame. We don't use the very last packet in the frame
356 for this purpose, because that would leave very little time to set
357 the timestamp before DMA starts on the next frame.
358 */
359
360 if (f->n_packets == 0) {
361 first_packet = 1;
362 } else if ( full_packets == (packets_per_frame-1) ) {
363 last_packet = 1;
364 } else if (f->n_packets == packets_per_frame) {
365 mid_packet = 1;
366 }
367
368
369 /********************/
370 /* setup CIP header */
371 /********************/
372
373 /* the timestamp will be written later from the
374 mid-frame interrupt handler. For now we just
375 store the address of the CIP header(s) that
376 need a timestamp. */
377
378 /* first packet in the frame needs a timestamp */
379 if (first_packet) {
380 f->cip_syt1 = cip;
381 if (empty_packet)
382 first_packet_empty = 1;
383
384 } else if (first_packet_empty && (f->n_packets == 1) ) {
385 /* if the first packet was empty, the second
386 packet's CIP header also needs a timestamp */
387 f->cip_syt2 = cip;
388 }
389
390 fill_cip_header(cip,
391 /* the node ID number of the OHCI card */
392 reg_read(video->ohci, OHCI1394_NodeID) & 0x3F,
393 video->continuity_counter,
394 video->pal_or_ntsc,
395 0xFFFF /* the timestamp is filled in later */);
396
397 /* advance counter, only for full packets */
398 if ( ! empty_packet )
399 video->continuity_counter++;
400
401 /******************************/
402 /* setup DMA descriptor block */
403 /******************************/
404
405 /* first descriptor - OUTPUT_MORE_IMMEDIATE, for the controller's IT header */
406 fill_output_more_immediate( &(block->u.out.omi), 1, video->channel, 0, payload_size);
407
408 if (empty_packet) {
409 /* second descriptor - OUTPUT_LAST for CIP header */
410 fill_output_last( &(block->u.out.u.empty.ol),
411
412 /* want completion status on all interesting packets */
413 (first_packet || mid_packet || last_packet) ? 1 : 0,
414
415 /* want interrupts on all interesting packets */
416 (first_packet || mid_packet || last_packet) ? 1 : 0,
417
418 sizeof(struct CIP_header), /* data size */
419 cip_dma);
420
421 if (first_packet)
422 f->frame_begin_timestamp = &(block->u.out.u.empty.ol.q[3]);
423 else if (mid_packet)
424 f->mid_frame_timestamp = &(block->u.out.u.empty.ol.q[3]);
425 else if (last_packet) {
426 f->frame_end_timestamp = &(block->u.out.u.empty.ol.q[3]);
427 f->frame_end_branch = &(block->u.out.u.empty.ol.q[2]);
428 }
429
430 branch_address = &(block->u.out.u.empty.ol.q[2]);
431 n_descriptors = 3;
432 if (first_packet)
433 f->first_n_descriptors = n_descriptors;
434
435 } else { /* full packet */
436
437 /* second descriptor - OUTPUT_MORE for CIP header */
438 fill_output_more( &(block->u.out.u.full.om),
439 sizeof(struct CIP_header), /* data size */
440 cip_dma);
441
442
443 /* third (and possibly fourth) descriptor - for DV data */
444 /* the 480-byte payload can cross a page boundary; if so,
445 we need to split it into two DMA descriptors */
446
447 /* does the 480-byte data payload cross a page boundary? */
448 if ( (PAGE_SIZE- ((unsigned long)data_p % PAGE_SIZE) ) < 480 ) {
449
450 /* page boundary crossed */
451
452 fill_output_more( &(block->u.out.u.full.u.cross.om),
453 /* data size - how much of data_p fits on the first page */
454 PAGE_SIZE - (data_p % PAGE_SIZE),
455
456 /* DMA address of data_p */
457 dma_region_offset_to_bus(&video->dv_buf,
458 data_p - (unsigned long) video->dv_buf.kvirt));
459
460 fill_output_last( &(block->u.out.u.full.u.cross.ol),
461
462 /* want completion status on all interesting packets */
463 (first_packet || mid_packet || last_packet) ? 1 : 0,
464
465 /* want interrupt on all interesting packets */
466 (first_packet || mid_packet || last_packet) ? 1 : 0,
467
468 /* data size - remaining portion of data_p */
469 480 - (PAGE_SIZE - (data_p % PAGE_SIZE)),
470
471 /* DMA address of data_p + PAGE_SIZE - (data_p % PAGE_SIZE) */
472 dma_region_offset_to_bus(&video->dv_buf,
473 data_p + PAGE_SIZE - (data_p % PAGE_SIZE) - (unsigned long) video->dv_buf.kvirt));
474
475 if (first_packet)
476 f->frame_begin_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
477 else if (mid_packet)
478 f->mid_frame_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
479 else if (last_packet) {
480 f->frame_end_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
481 f->frame_end_branch = &(block->u.out.u.full.u.cross.ol.q[2]);
482 }
483
484 branch_address = &(block->u.out.u.full.u.cross.ol.q[2]);
485
486 n_descriptors = 5;
487 if (first_packet)
488 f->first_n_descriptors = n_descriptors;
489
490 full_packets++;
491
492 } else {
493 /* fits on one page */
494
495 fill_output_last( &(block->u.out.u.full.u.nocross.ol),
496
497 /* want completion status on all interesting packets */
498 (first_packet || mid_packet || last_packet) ? 1 : 0,
499
500 /* want interrupt on all interesting packets */
501 (first_packet || mid_packet || last_packet) ? 1 : 0,
502
503 480, /* data size (480 bytes of DV data) */
504
505
506 /* DMA address of data_p */
507 dma_region_offset_to_bus(&video->dv_buf,
508 data_p - (unsigned long) video->dv_buf.kvirt));
509
510 if (first_packet)
511 f->frame_begin_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
512 else if (mid_packet)
513 f->mid_frame_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
514 else if (last_packet) {
515 f->frame_end_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
516 f->frame_end_branch = &(block->u.out.u.full.u.nocross.ol.q[2]);
517 }
518
519 branch_address = &(block->u.out.u.full.u.nocross.ol.q[2]);
520
521 n_descriptors = 4;
522 if (first_packet)
523 f->first_n_descriptors = n_descriptors;
524
525 full_packets++;
526 }
527 }
528
529 /* link this descriptor block into the DMA program by filling in
530 the branch address of the previous block */
531
532 /* note: we are not linked into the active DMA chain yet */
533
534 if (last_branch_address) {
535 *(last_branch_address) = cpu_to_le32(block_dma | n_descriptors);
536 }
537
538 last_branch_address = branch_address;
539
540
541 f->n_packets++;
542
543 }
544
545 /* when we first assemble a new frame, set the final branch
546 to loop back up to the top */
547 *(f->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
548
549 /* make the latest version of this frame visible to the PCI card */
550 dma_region_sync_for_device(&video->dv_buf, f->data - (unsigned long) video->dv_buf.kvirt, video->frame_size);
551
552 /* lock against DMA interrupt */
553 spin_lock_irqsave(&video->spinlock, irq_flags);
554
555 f->state = FRAME_READY;
556
557 video->n_clear_frames--;
558
559 last_frame = video->first_clear_frame - 1;
560 if (last_frame == -1)
561 last_frame = video->n_frames-1;
562
563 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
564
565 irq_printk(" frame %d prepared, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n last=%d\n",
566 this_frame, video->active_frame, video->n_clear_frames, video->first_clear_frame, last_frame);
567
568 irq_printk(" begin_ts %08lx mid_ts %08lx end_ts %08lx end_br %08lx\n",
569 (unsigned long) f->frame_begin_timestamp,
570 (unsigned long) f->mid_frame_timestamp,
571 (unsigned long) f->frame_end_timestamp,
572 (unsigned long) f->frame_end_branch);
573
574 if (video->active_frame != -1) {
575
576 /* if DMA is already active, we are almost done */
577 /* just link us onto the active DMA chain */
578 if (video->frames[last_frame]->frame_end_branch) {
579 u32 temp;
580
581 /* point the previous frame's tail to this frame's head */
582 *(video->frames[last_frame]->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
583
584 /* this write MUST precede the next one, or we could silently drop frames */
585 wmb();
586
587 /* disable the want_status semaphore on the last packet */
588 temp = le32_to_cpu(*(video->frames[last_frame]->frame_end_branch - 2));
589 temp &= 0xF7CFFFFF;
590 *(video->frames[last_frame]->frame_end_branch - 2) = cpu_to_le32(temp);
591
592 /* flush these writes to memory ASAP */
593 flush_pci_write(video->ohci);
594
595 /* NOTE:
596 ideally the writes should be "atomic": if
597 the OHCI card reads the want_status flag in
598 between them, we'll falsely report a
599 dropped frame. Hopefully this window is too
600 small to really matter, and the consequence
601 is rather harmless. */
602
603
604 irq_printk(" new frame %d linked onto DMA chain\n", this_frame);
605
606 } else {
607 printk(KERN_ERR "dv1394: last frame not ready???\n");
608 }
609
610 } else {
611
612 u32 transmit_sec, transmit_cyc;
613 u32 ts_cyc, ts_off;
614
615 /* DMA is stopped, so this is the very first frame */
616 video->active_frame = this_frame;
617
618 /* set CommandPtr to address and size of first descriptor block */
619 reg_write(video->ohci, video->ohci_IsoXmitCommandPtr,
620 video->frames[video->active_frame]->descriptor_pool_dma |
621 f->first_n_descriptors);
622
623 /* assign a timestamp based on the current cycle time...
624 We'll tell the card to begin DMA 100 cycles from now,
625 and assign a timestamp 103 cycles from now */
626
627 cycleTimer = reg_read(video->ohci, OHCI1394_IsochronousCycleTimer);
628
629 ct_sec = cycleTimer >> 25;
630 ct_cyc = (cycleTimer >> 12) & 0x1FFF;
631 ct_off = cycleTimer & 0xFFF;
632
633 transmit_sec = ct_sec;
634 transmit_cyc = ct_cyc + 100;
635
636 transmit_sec += transmit_cyc/8000;
637 transmit_cyc %= 8000;
638
639 ts_off = ct_off;
640 ts_cyc = transmit_cyc + 3;
641 ts_cyc %= 8000;
642
643 f->assigned_timestamp = (ts_cyc&0xF) << 12;
644
645 /* now actually write the timestamp into the appropriate CIP headers */
646 if (f->cip_syt1) {
647 f->cip_syt1->b[6] = f->assigned_timestamp >> 8;
648 f->cip_syt1->b[7] = f->assigned_timestamp & 0xFF;
649 }
650 if (f->cip_syt2) {
651 f->cip_syt2->b[6] = f->assigned_timestamp >> 8;
652 f->cip_syt2->b[7] = f->assigned_timestamp & 0xFF;
653 }
654
655 /* --- start DMA --- */
656
657 /* clear all bits in ContextControl register */
658
659 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, 0xFFFFFFFF);
660 wmb();
661
662 /* the OHCI card has the ability to start ISO transmission on a
663 particular cycle (start-on-cycle). This way we can ensure that
664 the first DV frame will have an accurate timestamp.
665
666 However, start-on-cycle only appears to work if the OHCI card
667 is cycle master! Since the consequences of messing up the first
668 timestamp are minimal*, just disable start-on-cycle for now.
669
670 * my DV deck drops the first few frames before it "locks in;"
671 so the first frame having an incorrect timestamp is inconsequential.
672 */
673
674 #if 0
675 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet,
676 (1 << 31) /* enable start-on-cycle */
677 | ( (transmit_sec & 0x3) << 29)
678 | (transmit_cyc << 16));
679 wmb();
680 #endif
681
682 video->dma_running = 1;
683
684 /* set the 'run' bit */
685 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, 0x8000);
686 flush_pci_write(video->ohci);
687
688 /* --- DMA should be running now --- */
689
690 debug_printk(" Cycle = %4u ContextControl = %08x CmdPtr = %08x\n",
691 (reg_read(video->ohci, OHCI1394_IsochronousCycleTimer) >> 12) & 0x1FFF,
692 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
693 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
694
695 debug_printk(" DMA start - current cycle %4u, transmit cycle %4u (%2u), assigning ts cycle %2u\n",
696 ct_cyc, transmit_cyc, transmit_cyc & 0xF, ts_cyc & 0xF);
697
698 #if DV1394_DEBUG_LEVEL >= 2
699 {
700 /* check if DMA is really running */
701 int i = 0;
702 while (i < 20) {
703 mb();
704 mdelay(1);
705 if (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) {
706 printk("DMA ACTIVE after %d msec\n", i);
707 break;
708 }
709 i++;
710 }
711
712 printk("set = %08x, cmdPtr = %08x\n",
713 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
714 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
715 );
716
717 if ( ! (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
718 printk("DMA did NOT go active after 20ms, event = %x\n",
719 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & 0x1F);
720 } else
721 printk("DMA is RUNNING!\n");
722 }
723 #endif
724
725 }
726
727
728 spin_unlock_irqrestore(&video->spinlock, irq_flags);
729 }
730
731
732
733 /*** RECEIVE FUNCTIONS *****************************************************/
734
735 /*
736 frame method put_packet
737
738 map and copy the packet data to its location in the frame
739 based upon DIF section and sequence
740 */
741
742 static void inline
743 frame_put_packet (struct frame *f, struct packet *p)
744 {
745 int section_type = p->data[0] >> 5; /* section type is in bits 5 - 7 */
746 int dif_sequence = p->data[1] >> 4; /* dif sequence number is in bits 4 - 7 */
747 int dif_block = p->data[2];
748
749 /* sanity check */
750 if (dif_sequence > 11 || dif_block > 149) return;
751
752 switch (section_type) {
753 case 0: /* 1 Header block */
754 memcpy( (void *) f->data + dif_sequence * 150 * 80, p->data, 480);
755 break;
756
757 case 1: /* 2 Subcode blocks */
758 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (1 + dif_block) * 80, p->data, 480);
759 break;
760
761 case 2: /* 3 VAUX blocks */
762 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (3 + dif_block) * 80, p->data, 480);
763 break;
764
765 case 3: /* 9 Audio blocks interleaved with video */
766 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (6 + dif_block * 16) * 80, p->data, 480);
767 break;
768
769 case 4: /* 135 Video blocks interleaved with audio */
770 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (7 + (dif_block / 15) + dif_block) * 80, p->data, 480);
771 break;
772
773 default: /* we can not handle any other data */
774 break;
775 }
776 }
777
778
779 static void start_dma_receive(struct video_card *video)
780 {
781 if (video->first_run == 1) {
782 video->first_run = 0;
783
784 /* start DMA once all of the frames are READY */
785 video->n_clear_frames = 0;
786 video->first_clear_frame = -1;
787 video->current_packet = 0;
788 video->active_frame = 0;
789
790 /* reset iso recv control register */
791 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, 0xFFFFFFFF);
792 wmb();
793
794 /* clear bufferFill, set isochHeader and speed (0=100) */
795 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x40000000);
796
797 /* match on all tags, listen on channel */
798 reg_write(video->ohci, video->ohci_IsoRcvContextMatch, 0xf0000000 | video->channel);
799
800 /* address and first descriptor block + Z=1 */
801 reg_write(video->ohci, video->ohci_IsoRcvCommandPtr,
802 video->frames[0]->descriptor_pool_dma | 1); /* Z=1 */
803 wmb();
804
805 video->dma_running = 1;
806
807 /* run */
808 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x8000);
809 flush_pci_write(video->ohci);
810
811 debug_printk("dv1394: DMA started\n");
812
813 #if DV1394_DEBUG_LEVEL >= 2
814 {
815 int i;
816
817 for (i = 0; i < 1000; ++i) {
818 mdelay(1);
819 if (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) {
820 printk("DMA ACTIVE after %d msec\n", i);
821 break;
822 }
823 }
824 if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) {
825 printk("DEAD, event = %x\n",
826 reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
827 } else
828 printk("RUNNING!\n");
829 }
830 #endif
831 } else if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) {
832 debug_printk("DEAD, event = %x\n",
833 reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
834
835 /* wake */
836 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
837 }
838 }
839
840
841 /*
842 receive_packets() - build the DMA program for receiving
843 */
844
845 static void receive_packets(struct video_card *video)
846 {
847 struct DMA_descriptor_block *block = NULL;
848 dma_addr_t block_dma = 0;
849 struct packet *data = NULL;
850 dma_addr_t data_dma = 0;
851 __le32 *last_branch_address = NULL;
852 unsigned long irq_flags;
853 int want_interrupt = 0;
854 struct frame *f = NULL;
855 int i, j;
856
857 spin_lock_irqsave(&video->spinlock, irq_flags);
858
859 for (j = 0; j < video->n_frames; j++) {
860
861 /* connect frames */
862 if (j > 0 && f != NULL && f->frame_end_branch != NULL)
863 *(f->frame_end_branch) = cpu_to_le32(video->frames[j]->descriptor_pool_dma | 1); /* set Z=1 */
864
865 f = video->frames[j];
866
867 for (i = 0; i < MAX_PACKETS; i++) {
868 /* locate a descriptor block and packet from the buffer */
869 block = &(f->descriptor_pool[i]);
870 block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
871
872 data = ((struct packet*)video->packet_buf.kvirt) + f->frame_num * MAX_PACKETS + i;
873 data_dma = dma_region_offset_to_bus( &video->packet_buf,
874 ((unsigned long) data - (unsigned long) video->packet_buf.kvirt) );
875
876 /* setup DMA descriptor block */
877 want_interrupt = ((i % (MAX_PACKETS/2)) == 0 || i == (MAX_PACKETS-1));
878 fill_input_last( &(block->u.in.il), want_interrupt, 512, data_dma);
879
880 /* link descriptors */
881 last_branch_address = f->frame_end_branch;
882
883 if (last_branch_address != NULL)
884 *(last_branch_address) = cpu_to_le32(block_dma | 1); /* set Z=1 */
885
886 f->frame_end_branch = &(block->u.in.il.q[2]);
887 }
888
889 } /* next j */
890
891 spin_unlock_irqrestore(&video->spinlock, irq_flags);
892
893 }
894
895
896
897 /*** MANAGEMENT FUNCTIONS **************************************************/
898
899 static int do_dv1394_init(struct video_card *video, struct dv1394_init *init)
900 {
901 unsigned long flags, new_buf_size;
902 int i;
903 u64 chan_mask;
904 int retval = -EINVAL;
905
906 debug_printk("dv1394: initialising %d\n", video->id);
907 if (init->api_version != DV1394_API_VERSION)
908 return -EINVAL;
909
910 /* first sanitize all the parameters */
911 if ( (init->n_frames < 2) || (init->n_frames > DV1394_MAX_FRAMES) )
912 return -EINVAL;
913
914 if ( (init->format != DV1394_NTSC) && (init->format != DV1394_PAL) )
915 return -EINVAL;
916
917 if ( (init->syt_offset == 0) || (init->syt_offset > 50) )
918 /* default SYT offset is 3 cycles */
919 init->syt_offset = 3;
920
921 if (init->channel > 63)
922 init->channel = 63;
923
924 chan_mask = (u64)1 << init->channel;
925
926 /* calculate what size DMA buffer is needed */
927 if (init->format == DV1394_NTSC)
928 new_buf_size = DV1394_NTSC_FRAME_SIZE * init->n_frames;
929 else
930 new_buf_size = DV1394_PAL_FRAME_SIZE * init->n_frames;
931
932 /* round up to PAGE_SIZE */
933 if (new_buf_size % PAGE_SIZE) new_buf_size += PAGE_SIZE - (new_buf_size % PAGE_SIZE);
934
935 /* don't allow the user to allocate the DMA buffer more than once */
936 if (video->dv_buf.kvirt && video->dv_buf_size != new_buf_size) {
937 printk("dv1394: re-sizing the DMA buffer is not allowed\n");
938 return -EINVAL;
939 }
940
941 /* shutdown the card if it's currently active */
942 /* (the card should not be reset if the parameters are screwy) */
943
944 do_dv1394_shutdown(video, 0);
945
946 /* try to claim the ISO channel */
947 spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
948 if (video->ohci->ISO_channel_usage & chan_mask) {
949 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
950 retval = -EBUSY;
951 goto err;
952 }
953 video->ohci->ISO_channel_usage |= chan_mask;
954 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
955
956 video->channel = init->channel;
957
958 /* initialize misc. fields of video */
959 video->n_frames = init->n_frames;
960 video->pal_or_ntsc = init->format;
961
962 video->cip_accum = 0;
963 video->continuity_counter = 0;
964
965 video->active_frame = -1;
966 video->first_clear_frame = 0;
967 video->n_clear_frames = video->n_frames;
968 video->dropped_frames = 0;
969
970 video->write_off = 0;
971
972 video->first_run = 1;
973 video->current_packet = -1;
974 video->first_frame = 0;
975
976 if (video->pal_or_ntsc == DV1394_NTSC) {
977 video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_NTSC;
978 video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_NTSC;
979 video->frame_size = DV1394_NTSC_FRAME_SIZE;
980 } else {
981 video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_PAL;
982 video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_PAL;
983 video->frame_size = DV1394_PAL_FRAME_SIZE;
984 }
985
986 video->syt_offset = init->syt_offset;
987
988 /* find and claim DMA contexts on the OHCI card */
989
990 if (video->ohci_it_ctx == -1) {
991 ohci1394_init_iso_tasklet(&video->it_tasklet, OHCI_ISO_TRANSMIT,
992 it_tasklet_func, (unsigned long) video);
993
994 if (ohci1394_register_iso_tasklet(video->ohci, &video->it_tasklet) < 0) {
995 printk(KERN_ERR "dv1394: could not find an available IT DMA context\n");
996 retval = -EBUSY;
997 goto err;
998 }
999
1000 video->ohci_it_ctx = video->it_tasklet.context;
1001 debug_printk("dv1394: claimed IT DMA context %d\n", video->ohci_it_ctx);
1002 }
1003
1004 if (video->ohci_ir_ctx == -1) {
1005 ohci1394_init_iso_tasklet(&video->ir_tasklet, OHCI_ISO_RECEIVE,
1006 ir_tasklet_func, (unsigned long) video);
1007
1008 if (ohci1394_register_iso_tasklet(video->ohci, &video->ir_tasklet) < 0) {
1009 printk(KERN_ERR "dv1394: could not find an available IR DMA context\n");
1010 retval = -EBUSY;
1011 goto err;
1012 }
1013 video->ohci_ir_ctx = video->ir_tasklet.context;
1014 debug_printk("dv1394: claimed IR DMA context %d\n", video->ohci_ir_ctx);
1015 }
1016
1017 /* allocate struct frames */
1018 for (i = 0; i < init->n_frames; i++) {
1019 video->frames[i] = frame_new(i, video);
1020
1021 if (!video->frames[i]) {
1022 printk(KERN_ERR "dv1394: Cannot allocate frame structs\n");
1023 retval = -ENOMEM;
1024 goto err;
1025 }
1026 }
1027
1028 if (!video->dv_buf.kvirt) {
1029 /* allocate the ringbuffer */
1030 retval = dma_region_alloc(&video->dv_buf, new_buf_size, video->ohci->dev, PCI_DMA_TODEVICE);
1031 if (retval)
1032 goto err;
1033
1034 video->dv_buf_size = new_buf_size;
1035
1036 debug_printk("dv1394: Allocated %d frame buffers, total %u pages (%u DMA pages), %lu bytes\n",
1037 video->n_frames, video->dv_buf.n_pages,
1038 video->dv_buf.n_dma_pages, video->dv_buf_size);
1039 }
1040
1041 /* set up the frame->data pointers */
1042 for (i = 0; i < video->n_frames; i++)
1043 video->frames[i]->data = (unsigned long) video->dv_buf.kvirt + i * video->frame_size;
1044
1045 if (!video->packet_buf.kvirt) {
1046 /* allocate packet buffer */
1047 video->packet_buf_size = sizeof(struct packet) * video->n_frames * MAX_PACKETS;
1048 if (video->packet_buf_size % PAGE_SIZE)
1049 video->packet_buf_size += PAGE_SIZE - (video->packet_buf_size % PAGE_SIZE);
1050
1051 retval = dma_region_alloc(&video->packet_buf, video->packet_buf_size,
1052 video->ohci->dev, PCI_DMA_FROMDEVICE);
1053 if (retval)
1054 goto err;
1055
1056 debug_printk("dv1394: Allocated %d packets in buffer, total %u pages (%u DMA pages), %lu bytes\n",
1057 video->n_frames*MAX_PACKETS, video->packet_buf.n_pages,
1058 video->packet_buf.n_dma_pages, video->packet_buf_size);
1059 }
1060
1061 /* set up register offsets for IT context */
1062 /* IT DMA context registers are spaced 16 bytes apart */
1063 video->ohci_IsoXmitContextControlSet = OHCI1394_IsoXmitContextControlSet+16*video->ohci_it_ctx;
1064 video->ohci_IsoXmitContextControlClear = OHCI1394_IsoXmitContextControlClear+16*video->ohci_it_ctx;
1065 video->ohci_IsoXmitCommandPtr = OHCI1394_IsoXmitCommandPtr+16*video->ohci_it_ctx;
1066
1067 /* enable interrupts for IT context */
1068 reg_write(video->ohci, OHCI1394_IsoXmitIntMaskSet, (1 << video->ohci_it_ctx));
1069 debug_printk("dv1394: interrupts enabled for IT context %d\n", video->ohci_it_ctx);
1070
1071 /* set up register offsets for IR context */
1072 /* IR DMA context registers are spaced 32 bytes apart */
1073 video->ohci_IsoRcvContextControlSet = OHCI1394_IsoRcvContextControlSet+32*video->ohci_ir_ctx;
1074 video->ohci_IsoRcvContextControlClear = OHCI1394_IsoRcvContextControlClear+32*video->ohci_ir_ctx;
1075 video->ohci_IsoRcvCommandPtr = OHCI1394_IsoRcvCommandPtr+32*video->ohci_ir_ctx;
1076 video->ohci_IsoRcvContextMatch = OHCI1394_IsoRcvContextMatch+32*video->ohci_ir_ctx;
1077
1078 /* enable interrupts for IR context */
1079 reg_write(video->ohci, OHCI1394_IsoRecvIntMaskSet, (1 << video->ohci_ir_ctx) );
1080 debug_printk("dv1394: interrupts enabled for IR context %d\n", video->ohci_ir_ctx);
1081
1082 return 0;
1083
1084 err:
1085 do_dv1394_shutdown(video, 1);
1086 return retval;
1087 }
1088
1089 /* if the user doesn't bother to call ioctl(INIT) before starting
1090 mmap() or read()/write(), just give him some default values */
1091
1092 static int do_dv1394_init_default(struct video_card *video)
1093 {
1094 struct dv1394_init init;
1095
1096 init.api_version = DV1394_API_VERSION;
1097 init.n_frames = DV1394_MAX_FRAMES / 4;
1098 init.channel = video->channel;
1099 init.format = video->pal_or_ntsc;
1100 init.cip_n = video->cip_n;
1101 init.cip_d = video->cip_d;
1102 init.syt_offset = video->syt_offset;
1103
1104 return do_dv1394_init(video, &init);
1105 }
1106
1107 /* do NOT call from interrupt context */
1108 static void stop_dma(struct video_card *video)
1109 {
1110 unsigned long flags;
1111 int i;
1112
1113 /* no interrupts */
1114 spin_lock_irqsave(&video->spinlock, flags);
1115
1116 video->dma_running = 0;
1117
1118 if ( (video->ohci_it_ctx == -1) && (video->ohci_ir_ctx == -1) )
1119 goto out;
1120
1121 /* stop DMA if in progress */
1122 if ( (video->active_frame != -1) ||
1123 (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
1124 (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) {
1125
1126 /* clear the .run bits */
1127 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
1128 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
1129 flush_pci_write(video->ohci);
1130
1131 video->active_frame = -1;
1132 video->first_run = 1;
1133
1134 /* wait until DMA really stops */
1135 i = 0;
1136 while (i < 1000) {
1137
1138 /* wait 0.1 millisecond */
1139 udelay(100);
1140
1141 if ( (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
1142 (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) {
1143 /* still active */
1144 debug_printk("dv1394: stop_dma: DMA not stopped yet\n" );
1145 mb();
1146 } else {
1147 debug_printk("dv1394: stop_dma: DMA stopped safely after %d ms\n", i/10);
1148 break;
1149 }
1150
1151 i++;
1152 }
1153
1154 if (i == 1000) {
1155 printk(KERN_ERR "dv1394: stop_dma: DMA still going after %d ms!\n", i/10);
1156 }
1157 }
1158 else
1159 debug_printk("dv1394: stop_dma: already stopped.\n");
1160
1161 out:
1162 spin_unlock_irqrestore(&video->spinlock, flags);
1163 }
1164
1165
1166
1167 static void do_dv1394_shutdown(struct video_card *video, int free_dv_buf)
1168 {
1169 int i;
1170
1171 debug_printk("dv1394: shutdown...\n");
1172
1173 /* stop DMA if in progress */
1174 stop_dma(video);
1175
1176 /* release the DMA contexts */
1177 if (video->ohci_it_ctx != -1) {
1178 video->ohci_IsoXmitContextControlSet = 0;
1179 video->ohci_IsoXmitContextControlClear = 0;
1180 video->ohci_IsoXmitCommandPtr = 0;
1181
1182 /* disable interrupts for IT context */
1183 reg_write(video->ohci, OHCI1394_IsoXmitIntMaskClear, (1 << video->ohci_it_ctx));
1184
1185 /* remove tasklet */
1186 ohci1394_unregister_iso_tasklet(video->ohci, &video->it_tasklet);
1187 debug_printk("dv1394: IT context %d released\n", video->ohci_it_ctx);
1188 video->ohci_it_ctx = -1;
1189 }
1190
1191 if (video->ohci_ir_ctx != -1) {
1192 video->ohci_IsoRcvContextControlSet = 0;
1193 video->ohci_IsoRcvContextControlClear = 0;
1194 video->ohci_IsoRcvCommandPtr = 0;
1195 video->ohci_IsoRcvContextMatch = 0;
1196
1197 /* disable interrupts for IR context */
1198 reg_write(video->ohci, OHCI1394_IsoRecvIntMaskClear, (1 << video->ohci_ir_ctx));
1199
1200 /* remove tasklet */
1201 ohci1394_unregister_iso_tasklet(video->ohci, &video->ir_tasklet);
1202 debug_printk("dv1394: IR context %d released\n", video->ohci_ir_ctx);
1203 video->ohci_ir_ctx = -1;
1204 }
1205
1206 /* release the ISO channel */
1207 if (video->channel != -1) {
1208 u64 chan_mask;
1209 unsigned long flags;
1210
1211 chan_mask = (u64)1 << video->channel;
1212
1213 spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
1214 video->ohci->ISO_channel_usage &= ~(chan_mask);
1215 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
1216
1217 video->channel = -1;
1218 }
1219
1220 /* free the frame structs */
1221 for (i = 0; i < DV1394_MAX_FRAMES; i++) {
1222 if (video->frames[i])
1223 frame_delete(video->frames[i]);
1224 video->frames[i] = NULL;
1225 }
1226
1227 video->n_frames = 0;
1228
1229 /* we can't free the DMA buffer unless it is guaranteed that
1230 no more user-space mappings exist */
1231
1232 if (free_dv_buf) {
1233 dma_region_free(&video->dv_buf);
1234 video->dv_buf_size = 0;
1235 }
1236
1237 /* free packet buffer */
1238 dma_region_free(&video->packet_buf);
1239 video->packet_buf_size = 0;
1240
1241 debug_printk("dv1394: shutdown OK\n");
1242 }
1243
1244 /*
1245 **********************************
1246 *** MMAP() THEORY OF OPERATION ***
1247 **********************************
1248
1249 The ringbuffer cannot be re-allocated or freed while
1250 a user program maintains a mapping of it. (note that a mapping
1251 can persist even after the device fd is closed!)
1252
1253 So, only let the user process allocate the DMA buffer once.
1254 To resize or deallocate it, you must close the device file
1255 and open it again.
1256
1257 Previously Dan M. hacked out a scheme that allowed the DMA
1258 buffer to change by forcefully unmapping it from the user's
1259 address space. It was prone to error because it's very hard to
1260 track all the places the buffer could have been mapped (we
1261 would have had to walk the vma list of every process in the
1262 system to be sure we found all the mappings!). Instead, we
1263 force the user to choose one buffer size and stick with
1264 it. This small sacrifice is worth the huge reduction in
1265 error-prone code in dv1394.
1266 */
1267
1268 static int dv1394_mmap(struct file *file, struct vm_area_struct *vma)
1269 {
1270 struct video_card *video = file_to_video_card(file);
1271 int retval = -EINVAL;
1272
1273 /*
1274 * We cannot use the blocking variant mutex_lock here because .mmap
1275 * is called with mmap_sem held, while .ioctl, .read, .write acquire
1276 * video->mtx and subsequently call copy_to/from_user which will
1277 * grab mmap_sem in case of a page fault.
1278 */
1279 if (!mutex_trylock(&video->mtx))
1280 return -EAGAIN;
1281
1282 if ( ! video_card_initialized(video) ) {
1283 retval = do_dv1394_init_default(video);
1284 if (retval)
1285 goto out;
1286 }
1287
1288 retval = dma_region_mmap(&video->dv_buf, file, vma);
1289 out:
1290 mutex_unlock(&video->mtx);
1291 return retval;
1292 }
1293
1294 /*** DEVICE FILE INTERFACE *************************************************/
1295
1296 /* no need to serialize, multiple threads OK */
1297 static unsigned int dv1394_poll(struct file *file, struct poll_table_struct *wait)
1298 {
1299 struct video_card *video = file_to_video_card(file);
1300 unsigned int mask = 0;
1301 unsigned long flags;
1302
1303 poll_wait(file, &video->waitq, wait);
1304
1305 spin_lock_irqsave(&video->spinlock, flags);
1306 if ( video->n_frames == 0 ) {
1307
1308 } else if ( video->active_frame == -1 ) {
1309 /* nothing going on */
1310 mask |= POLLOUT;
1311 } else {
1312 /* any clear/ready buffers? */
1313 if (video->n_clear_frames >0)
1314 mask |= POLLOUT | POLLIN;
1315 }
1316 spin_unlock_irqrestore(&video->spinlock, flags);
1317
1318 return mask;
1319 }
1320
1321 static int dv1394_fasync(int fd, struct file *file, int on)
1322 {
1323 /* I just copied this code verbatim from Alan Cox's mouse driver example
1324 (Documentation/DocBook/) */
1325
1326 struct video_card *video = file_to_video_card(file);
1327
1328 return fasync_helper(fd, file, on, &video->fasync);
1329 }
1330
1331 static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
1332 {
1333 struct video_card *video = file_to_video_card(file);
1334 DECLARE_WAITQUEUE(wait, current);
1335 ssize_t ret;
1336 size_t cnt;
1337 unsigned long flags;
1338 int target_frame;
1339
1340 /* serialize this to prevent multi-threaded mayhem */
1341 if (file->f_flags & O_NONBLOCK) {
1342 if (!mutex_trylock(&video->mtx))
1343 return -EAGAIN;
1344 } else {
1345 if (mutex_lock_interruptible(&video->mtx))
1346 return -ERESTARTSYS;
1347 }
1348
1349 if ( !video_card_initialized(video) ) {
1350 ret = do_dv1394_init_default(video);
1351 if (ret) {
1352 mutex_unlock(&video->mtx);
1353 return ret;
1354 }
1355 }
1356
1357 ret = 0;
1358 add_wait_queue(&video->waitq, &wait);
1359
1360 while (count > 0) {
1361
1362 /* must set TASK_INTERRUPTIBLE *before* checking for free
1363 buffers; otherwise we could miss a wakeup if the interrupt
1364 fires between the check and the schedule() */
1365
1366 set_current_state(TASK_INTERRUPTIBLE);
1367
1368 spin_lock_irqsave(&video->spinlock, flags);
1369
1370 target_frame = video->first_clear_frame;
1371
1372 spin_unlock_irqrestore(&video->spinlock, flags);
1373
1374 if (video->frames[target_frame]->state == FRAME_CLEAR) {
1375
1376 /* how much room is left in the target frame buffer */
1377 cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1378
1379 } else {
1380 /* buffer is already used */
1381 cnt = 0;
1382 }
1383
1384 if (cnt > count)
1385 cnt = count;
1386
1387 if (cnt <= 0) {
1388 /* no room left, gotta wait */
1389 if (file->f_flags & O_NONBLOCK) {
1390 if (!ret)
1391 ret = -EAGAIN;
1392 break;
1393 }
1394 if (signal_pending(current)) {
1395 if (!ret)
1396 ret = -ERESTARTSYS;
1397 break;
1398 }
1399
1400 schedule();
1401
1402 continue; /* start over from 'while(count > 0)...' */
1403 }
1404
1405 if (copy_from_user(video->dv_buf.kvirt + video->write_off, buffer, cnt)) {
1406 if (!ret)
1407 ret = -EFAULT;
1408 break;
1409 }
1410
1411 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1412
1413 count -= cnt;
1414 buffer += cnt;
1415 ret += cnt;
1416
1417 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames))
1418 frame_prepare(video, target_frame);
1419 }
1420
1421 remove_wait_queue(&video->waitq, &wait);
1422 set_current_state(TASK_RUNNING);
1423 mutex_unlock(&video->mtx);
1424 return ret;
1425 }
1426
1427
1428 static ssize_t dv1394_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
1429 {
1430 struct video_card *video = file_to_video_card(file);
1431 DECLARE_WAITQUEUE(wait, current);
1432 ssize_t ret;
1433 size_t cnt;
1434 unsigned long flags;
1435 int target_frame;
1436
1437 /* serialize this to prevent multi-threaded mayhem */
1438 if (file->f_flags & O_NONBLOCK) {
1439 if (!mutex_trylock(&video->mtx))
1440 return -EAGAIN;
1441 } else {
1442 if (mutex_lock_interruptible(&video->mtx))
1443 return -ERESTARTSYS;
1444 }
1445
1446 if ( !video_card_initialized(video) ) {
1447 ret = do_dv1394_init_default(video);
1448 if (ret) {
1449 mutex_unlock(&video->mtx);
1450 return ret;
1451 }
1452 video->continuity_counter = -1;
1453
1454 receive_packets(video);
1455
1456 start_dma_receive(video);
1457 }
1458
1459 ret = 0;
1460 add_wait_queue(&video->waitq, &wait);
1461
1462 while (count > 0) {
1463
1464 /* must set TASK_INTERRUPTIBLE *before* checking for free
1465 buffers; otherwise we could miss a wakeup if the interrupt
1466 fires between the check and the schedule() */
1467
1468 set_current_state(TASK_INTERRUPTIBLE);
1469
1470 spin_lock_irqsave(&video->spinlock, flags);
1471
1472 target_frame = video->first_clear_frame;
1473
1474 spin_unlock_irqrestore(&video->spinlock, flags);
1475
1476 if (target_frame >= 0 &&
1477 video->n_clear_frames > 0 &&
1478 video->frames[target_frame]->state == FRAME_CLEAR) {
1479
1480 /* how much room is left in the target frame buffer */
1481 cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1482
1483 } else {
1484 /* buffer is already used */
1485 cnt = 0;
1486 }
1487
1488 if (cnt > count)
1489 cnt = count;
1490
1491 if (cnt <= 0) {
1492 /* no room left, gotta wait */
1493 if (file->f_flags & O_NONBLOCK) {
1494 if (!ret)
1495 ret = -EAGAIN;
1496 break;
1497 }
1498 if (signal_pending(current)) {
1499 if (!ret)
1500 ret = -ERESTARTSYS;
1501 break;
1502 }
1503
1504 schedule();
1505
1506 continue; /* start over from 'while(count > 0)...' */
1507 }
1508
1509 if (copy_to_user(buffer, video->dv_buf.kvirt + video->write_off, cnt)) {
1510 if (!ret)
1511 ret = -EFAULT;
1512 break;
1513 }
1514
1515 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1516
1517 count -= cnt;
1518 buffer += cnt;
1519 ret += cnt;
1520
1521 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) {
1522 spin_lock_irqsave(&video->spinlock, flags);
1523 video->n_clear_frames--;
1524 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
1525 spin_unlock_irqrestore(&video->spinlock, flags);
1526 }
1527 }
1528
1529 remove_wait_queue(&video->waitq, &wait);
1530 set_current_state(TASK_RUNNING);
1531 mutex_unlock(&video->mtx);
1532 return ret;
1533 }
1534
1535
1536 /*** DEVICE IOCTL INTERFACE ************************************************/
1537
1538 static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1539 {
1540 struct video_card *video = file_to_video_card(file);
1541 unsigned long flags;
1542 int ret = -EINVAL;
1543 void __user *argp = (void __user *)arg;
1544
1545 DECLARE_WAITQUEUE(wait, current);
1546
1547 /* serialize this to prevent multi-threaded mayhem */
1548 if (file->f_flags & O_NONBLOCK) {
1549 if (!mutex_trylock(&video->mtx))
1550 return -EAGAIN;
1551 } else {
1552 if (mutex_lock_interruptible(&video->mtx))
1553 return -ERESTARTSYS;
1554 }
1555
1556 switch(cmd)
1557 {
1558 case DV1394_IOC_SUBMIT_FRAMES: {
1559 unsigned int n_submit;
1560
1561 if ( !video_card_initialized(video) ) {
1562 ret = do_dv1394_init_default(video);
1563 if (ret)
1564 goto out;
1565 }
1566
1567 n_submit = (unsigned int) arg;
1568
1569 if (n_submit > video->n_frames) {
1570 ret = -EINVAL;
1571 goto out;
1572 }
1573
1574 while (n_submit > 0) {
1575
1576 add_wait_queue(&video->waitq, &wait);
1577 set_current_state(TASK_INTERRUPTIBLE);
1578
1579 spin_lock_irqsave(&video->spinlock, flags);
1580
1581 /* wait until video->first_clear_frame is really CLEAR */
1582 while (video->frames[video->first_clear_frame]->state != FRAME_CLEAR) {
1583
1584 spin_unlock_irqrestore(&video->spinlock, flags);
1585
1586 if (signal_pending(current)) {
1587 remove_wait_queue(&video->waitq, &wait);
1588 set_current_state(TASK_RUNNING);
1589 ret = -EINTR;
1590 goto out;
1591 }
1592
1593 schedule();
1594 set_current_state(TASK_INTERRUPTIBLE);
1595
1596 spin_lock_irqsave(&video->spinlock, flags);
1597 }
1598 spin_unlock_irqrestore(&video->spinlock, flags);
1599
1600 remove_wait_queue(&video->waitq, &wait);
1601 set_current_state(TASK_RUNNING);
1602
1603 frame_prepare(video, video->first_clear_frame);
1604
1605 n_submit--;
1606 }
1607
1608 ret = 0;
1609 break;
1610 }
1611
1612 case DV1394_IOC_WAIT_FRAMES: {
1613 unsigned int n_wait;
1614
1615 if ( !video_card_initialized(video) ) {
1616 ret = -EINVAL;
1617 goto out;
1618 }
1619
1620 n_wait = (unsigned int) arg;
1621
1622 /* since we re-run the last frame on underflow, we will
1623 never actually have n_frames clear frames; at most only
1624 n_frames - 1 */
1625
1626 if (n_wait > (video->n_frames-1) ) {
1627 ret = -EINVAL;
1628 goto out;
1629 }
1630
1631 add_wait_queue(&video->waitq, &wait);
1632 set_current_state(TASK_INTERRUPTIBLE);
1633
1634 spin_lock_irqsave(&video->spinlock, flags);
1635
1636 while (video->n_clear_frames < n_wait) {
1637
1638 spin_unlock_irqrestore(&video->spinlock, flags);
1639
1640 if (signal_pending(current)) {
1641 remove_wait_queue(&video->waitq, &wait);
1642 set_current_state(TASK_RUNNING);
1643 ret = -EINTR;
1644 goto out;
1645 }
1646
1647 schedule();
1648 set_current_state(TASK_INTERRUPTIBLE);
1649
1650 spin_lock_irqsave(&video->spinlock, flags);
1651 }
1652
1653 spin_unlock_irqrestore(&video->spinlock, flags);
1654
1655 remove_wait_queue(&video->waitq, &wait);
1656 set_current_state(TASK_RUNNING);
1657 ret = 0;
1658 break;
1659 }
1660
1661 case DV1394_IOC_RECEIVE_FRAMES: {
1662 unsigned int n_recv;
1663
1664 if ( !video_card_initialized(video) ) {
1665 ret = -EINVAL;
1666 goto out;
1667 }
1668
1669 n_recv = (unsigned int) arg;
1670
1671 /* at least one frame must be active */
1672 if (n_recv > (video->n_frames-1) ) {
1673 ret = -EINVAL;
1674 goto out;
1675 }
1676
1677 spin_lock_irqsave(&video->spinlock, flags);
1678
1679 /* release the clear frames */
1680 video->n_clear_frames -= n_recv;
1681
1682 /* advance the clear frame cursor */
1683 video->first_clear_frame = (video->first_clear_frame + n_recv) % video->n_frames;
1684
1685 /* reset dropped_frames */
1686 video->dropped_frames = 0;
1687
1688 spin_unlock_irqrestore(&video->spinlock, flags);
1689
1690 ret = 0;
1691 break;
1692 }
1693
1694 case DV1394_IOC_START_RECEIVE: {
1695 if ( !video_card_initialized(video) ) {
1696 ret = do_dv1394_init_default(video);
1697 if (ret)
1698 goto out;
1699 }
1700
1701 video->continuity_counter = -1;
1702
1703 receive_packets(video);
1704
1705 start_dma_receive(video);
1706
1707 ret = 0;
1708 break;
1709 }
1710
1711 case DV1394_IOC_INIT: {
1712 struct dv1394_init init;
1713 if (!argp) {
1714 ret = do_dv1394_init_default(video);
1715 } else {
1716 if (copy_from_user(&init, argp, sizeof(init))) {
1717 ret = -EFAULT;
1718 goto out;
1719 }
1720 ret = do_dv1394_init(video, &init);
1721 }
1722 break;
1723 }
1724
1725 case DV1394_IOC_SHUTDOWN:
1726 do_dv1394_shutdown(video, 0);
1727 ret = 0;
1728 break;
1729
1730
1731 case DV1394_IOC_GET_STATUS: {
1732 struct dv1394_status status;
1733
1734 if ( !video_card_initialized(video) ) {
1735 ret = -EINVAL;
1736 goto out;
1737 }
1738
1739 status.init.api_version = DV1394_API_VERSION;
1740 status.init.channel = video->channel;
1741 status.init.n_frames = video->n_frames;
1742 status.init.format = video->pal_or_ntsc;
1743 status.init.cip_n = video->cip_n;
1744 status.init.cip_d = video->cip_d;
1745 status.init.syt_offset = video->syt_offset;
1746
1747 status.first_clear_frame = video->first_clear_frame;
1748
1749 /* the rest of the fields need to be locked against the interrupt */
1750 spin_lock_irqsave(&video->spinlock, flags);
1751
1752 status.active_frame = video->active_frame;
1753 status.n_clear_frames = video->n_clear_frames;
1754
1755 status.dropped_frames = video->dropped_frames;
1756
1757 /* reset dropped_frames */
1758 video->dropped_frames = 0;
1759
1760 spin_unlock_irqrestore(&video->spinlock, flags);
1761
1762 if (copy_to_user(argp, &status, sizeof(status))) {
1763 ret = -EFAULT;
1764 goto out;
1765 }
1766
1767 ret = 0;
1768 break;
1769 }
1770
1771 default:
1772 break;
1773 }
1774
1775 out:
1776 mutex_unlock(&video->mtx);
1777 return ret;
1778 }
1779
1780 /*** DEVICE FILE INTERFACE CONTINUED ***************************************/
1781
1782 static int dv1394_open(struct inode *inode, struct file *file)
1783 {
1784 struct video_card *video = NULL;
1785
1786 if (file->private_data) {
1787 video = (struct video_card*) file->private_data;
1788
1789 } else {
1790 /* look up the card by ID */
1791 unsigned long flags;
1792 int idx = ieee1394_file_to_instance(file);
1793
1794 spin_lock_irqsave(&dv1394_cards_lock, flags);
1795 if (!list_empty(&dv1394_cards)) {
1796 struct video_card *p;
1797 list_for_each_entry(p, &dv1394_cards, list) {
1798 if ((p->id) == idx) {
1799 video = p;
1800 break;
1801 }
1802 }
1803 }
1804 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
1805
1806 if (!video) {
1807 debug_printk("dv1394: OHCI card %d not found", idx);
1808 return -ENODEV;
1809 }
1810
1811 file->private_data = (void*) video;
1812 }
1813
1814 #ifndef DV1394_ALLOW_MORE_THAN_ONE_OPEN
1815
1816 if ( test_and_set_bit(0, &video->open) ) {
1817 /* video is already open by someone else */
1818 return -EBUSY;
1819 }
1820
1821 #endif
1822
1823 printk(KERN_INFO "%s: NOTE, the dv1394 interface is unsupported "
1824 "and will not be available in the new firewire driver stack. "
1825 "Try libraw1394 based programs instead.\n", current->comm);
1826
1827 return 0;
1828 }
1829
1830
1831 static int dv1394_release(struct inode *inode, struct file *file)
1832 {
1833 struct video_card *video = file_to_video_card(file);
1834
1835 /* OK to free the DMA buffer, no more mappings can exist */
1836 do_dv1394_shutdown(video, 1);
1837
1838 /* give someone else a turn */
1839 clear_bit(0, &video->open);
1840
1841 return 0;
1842 }
1843
1844
1845 /*** DEVICE DRIVER HANDLERS ************************************************/
1846
1847 static void it_tasklet_func(unsigned long data)
1848 {
1849 int wake = 0;
1850 struct video_card *video = (struct video_card*) data;
1851
1852 spin_lock(&video->spinlock);
1853
1854 if (!video->dma_running)
1855 goto out;
1856
1857 irq_printk("ContextControl = %08x, CommandPtr = %08x\n",
1858 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
1859 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
1860 );
1861
1862
1863 if ( (video->ohci_it_ctx != -1) &&
1864 (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
1865
1866 struct frame *f;
1867 unsigned int frame, i;
1868
1869
1870 if (video->active_frame == -1)
1871 frame = 0;
1872 else
1873 frame = video->active_frame;
1874
1875 /* check all the DMA-able frames */
1876 for (i = 0; i < video->n_frames; i++, frame = (frame+1) % video->n_frames) {
1877
1878 irq_printk("IRQ checking frame %d...", frame);
1879 f = video->frames[frame];
1880 if (f->state != FRAME_READY) {
1881 irq_printk("clear, skipping\n");
1882 /* we don't own this frame */
1883 continue;
1884 }
1885
1886 irq_printk("DMA\n");
1887
1888 /* check the frame begin semaphore to see if we can free the previous frame */
1889 if ( *(f->frame_begin_timestamp) ) {
1890 int prev_frame;
1891 struct frame *prev_f;
1892
1893
1894
1895 /* don't reset, need this later *(f->frame_begin_timestamp) = 0; */
1896 irq_printk(" BEGIN\n");
1897
1898 prev_frame = frame - 1;
1899 if (prev_frame == -1)
1900 prev_frame += video->n_frames;
1901 prev_f = video->frames[prev_frame];
1902
1903 /* make sure we can actually garbage collect
1904 this frame */
1905 if ( (prev_f->state == FRAME_READY) &&
1906 prev_f->done && (!f->done) )
1907 {
1908 frame_reset(prev_f);
1909 video->n_clear_frames++;
1910 wake = 1;
1911 video->active_frame = frame;
1912
1913 irq_printk(" BEGIN - freeing previous frame %d, new active frame is %d\n", prev_frame, frame);
1914 } else {
1915 irq_printk(" BEGIN - can't free yet\n");
1916 }
1917
1918 f->done = 1;
1919 }
1920
1921
1922 /* see if we need to set the timestamp for the next frame */
1923 if ( *(f->mid_frame_timestamp) ) {
1924 struct frame *next_frame;
1925 u32 begin_ts, ts_cyc, ts_off;
1926
1927 *(f->mid_frame_timestamp) = 0;
1928
1929 begin_ts = le32_to_cpu(*(f->frame_begin_timestamp));
1930
1931 irq_printk(" MIDDLE - first packet was sent at cycle %4u (%2u), assigned timestamp was (%2u) %4u\n",
1932 begin_ts & 0x1FFF, begin_ts & 0xF,
1933 f->assigned_timestamp >> 12, f->assigned_timestamp & 0xFFF);
1934
1935 /* prepare next frame and assign timestamp */
1936 next_frame = video->frames[ (frame+1) % video->n_frames ];
1937
1938 if (next_frame->state == FRAME_READY) {
1939 irq_printk(" MIDDLE - next frame is ready, good\n");
1940 } else {
1941 debug_printk("dv1394: Underflow! At least one frame has been dropped.\n");
1942 next_frame = f;
1943 }
1944
1945 /* set the timestamp to the timestamp of the last frame sent,
1946 plus the length of the last frame sent, plus the syt latency */
1947 ts_cyc = begin_ts & 0xF;
1948 /* advance one frame, plus syt latency (typically 2-3) */
1949 ts_cyc += f->n_packets + video->syt_offset ;
1950
1951 ts_off = 0;
1952
1953 ts_cyc += ts_off/3072;
1954 ts_off %= 3072;
1955
1956 next_frame->assigned_timestamp = ((ts_cyc&0xF) << 12) + ts_off;
1957 if (next_frame->cip_syt1) {
1958 next_frame->cip_syt1->b[6] = next_frame->assigned_timestamp >> 8;
1959 next_frame->cip_syt1->b[7] = next_frame->assigned_timestamp & 0xFF;
1960 }
1961 if (next_frame->cip_syt2) {
1962 next_frame->cip_syt2->b[6] = next_frame->assigned_timestamp >> 8;
1963 next_frame->cip_syt2->b[7] = next_frame->assigned_timestamp & 0xFF;
1964 }
1965
1966 }
1967
1968 /* see if the frame looped */
1969 if ( *(f->frame_end_timestamp) ) {
1970
1971 *(f->frame_end_timestamp) = 0;
1972
1973 debug_printk(" END - the frame looped at least once\n");
1974
1975 video->dropped_frames++;
1976 }
1977
1978 } /* for (each frame) */
1979 }
1980
1981 if (wake) {
1982 kill_fasync(&video->fasync, SIGIO, POLL_OUT);
1983
1984 /* wake readers/writers/ioctl'ers */
1985 wake_up_interruptible(&video->waitq);
1986 }
1987
1988 out:
1989 spin_unlock(&video->spinlock);
1990 }
1991
1992 static void ir_tasklet_func(unsigned long data)
1993 {
1994 int wake = 0;
1995 struct video_card *video = (struct video_card*) data;
1996
1997 spin_lock(&video->spinlock);
1998
1999 if (!video->dma_running)
2000 goto out;
2001
2002 if ( (video->ohci_ir_ctx != -1) &&
2003 (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) ) {
2004
2005 int sof=0; /* start-of-frame flag */
2006 struct frame *f;
2007 u16 packet_length, packet_time;
2008 int i, dbc=0;
2009 struct DMA_descriptor_block *block = NULL;
2010 u16 xferstatus;
2011
2012 int next_i, prev_i;
2013 struct DMA_descriptor_block *next = NULL;
2014 dma_addr_t next_dma = 0;
2015 struct DMA_descriptor_block *prev = NULL;
2016
2017 /* loop over all descriptors in all frames */
2018 for (i = 0; i < video->n_frames*MAX_PACKETS; i++) {
2019 struct packet *p = dma_region_i(&video->packet_buf, struct packet, video->current_packet);
2020
2021 /* make sure we are seeing the latest changes to p */
2022 dma_region_sync_for_cpu(&video->packet_buf,
2023 (unsigned long) p - (unsigned long) video->packet_buf.kvirt,
2024 sizeof(struct packet));
2025
2026 packet_length = le16_to_cpu(p->data_length);
2027 packet_time = le16_to_cpu(p->timestamp);
2028
2029 irq_printk("received packet %02d, timestamp=%04x, length=%04x, sof=%02x%02x\n", video->current_packet,
2030 packet_time, packet_length,
2031 p->data[0], p->data[1]);
2032
2033 /* get the descriptor based on packet_buffer cursor */
2034 f = video->frames[video->current_packet / MAX_PACKETS];
2035 block = &(f->descriptor_pool[video->current_packet % MAX_PACKETS]);
2036 xferstatus = le32_to_cpu(block->u.in.il.q[3]) >> 16;
2037 xferstatus &= 0x1F;
2038 irq_printk("ir_tasklet_func: xferStatus/resCount [%d] = 0x%08x\n", i, le32_to_cpu(block->u.in.il.q[3]) );
2039
2040 /* get the current frame */
2041 f = video->frames[video->active_frame];
2042
2043 /* exclude empty packet */
2044 if (packet_length > 8 && xferstatus == 0x11) {
2045 /* check for start of frame */
2046 /* DRD> Changed to check section type ([0]>>5==0)
2047 and dif sequence ([1]>>4==0) */
2048 sof = ( (p->data[0] >> 5) == 0 && (p->data[1] >> 4) == 0);
2049
2050 dbc = (int) (p->cip_h1 >> 24);
2051 if ( video->continuity_counter != -1 && dbc > ((video->continuity_counter + 1) % 256) )
2052 {
2053 printk(KERN_WARNING "dv1394: discontinuity detected, dropping all frames\n" );
2054 video->dropped_frames += video->n_clear_frames + 1;
2055 video->first_frame = 0;
2056 video->n_clear_frames = 0;
2057 video->first_clear_frame = -1;
2058 }
2059 video->continuity_counter = dbc;
2060
2061 if (!video->first_frame) {
2062 if (sof) {
2063 video->first_frame = 1;
2064 }
2065
2066 } else if (sof) {
2067 /* close current frame */
2068 frame_reset(f); /* f->state = STATE_CLEAR */
2069 video->n_clear_frames++;
2070 if (video->n_clear_frames > video->n_frames) {
2071 video->dropped_frames++;
2072 printk(KERN_WARNING "dv1394: dropped a frame during reception\n" );
2073 video->n_clear_frames = video->n_frames-1;
2074 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
2075 }
2076 if (video->first_clear_frame == -1)
2077 video->first_clear_frame = video->active_frame;
2078
2079 /* get the next frame */
2080 video->active_frame = (video->active_frame + 1) % video->n_frames;
2081 f = video->frames[video->active_frame];
2082 irq_printk(" frame received, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n",
2083 video->active_frame, video->n_clear_frames, video->first_clear_frame);
2084 }
2085 if (video->first_frame) {
2086 if (sof) {
2087 /* open next frame */
2088 f->state = FRAME_READY;
2089 }
2090
2091 /* copy to buffer */
2092 if (f->n_packets > (video->frame_size / 480)) {
2093 printk(KERN_ERR "frame buffer overflow during receive\n");
2094 }
2095
2096 frame_put_packet(f, p);
2097
2098 } /* first_frame */
2099 }
2100
2101 /* stop, end of ready packets */
2102 else if (xferstatus == 0) {
2103 break;
2104 }
2105
2106 /* reset xferStatus & resCount */
2107 block->u.in.il.q[3] = cpu_to_le32(512);
2108
2109 /* terminate dma chain at this (next) packet */
2110 next_i = video->current_packet;
2111 f = video->frames[next_i / MAX_PACKETS];
2112 next = &(f->descriptor_pool[next_i % MAX_PACKETS]);
2113 next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
2114 next->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
2115 next->u.in.il.q[2] = cpu_to_le32(0); /* disable branch */
2116
2117 /* link previous to next */
2118 prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1);
2119 f = video->frames[prev_i / MAX_PACKETS];
2120 prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]);
2121 if (prev_i % (MAX_PACKETS/2)) {
2122 prev->u.in.il.q[0] &= ~cpu_to_le32(3 << 20); /* no interrupt */
2123 } else {
2124 prev->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
2125 }
2126 prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */
2127 wmb();
2128
2129 /* wake up DMA in case it fell asleep */
2130 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2131
2132 /* advance packet_buffer cursor */
2133 video->current_packet = (video->current_packet + 1) % (MAX_PACKETS * video->n_frames);
2134
2135 } /* for all packets */
2136
2137 wake = 1; /* why the hell not? */
2138
2139 } /* receive interrupt */
2140
2141 if (wake) {
2142 kill_fasync(&video->fasync, SIGIO, POLL_IN);
2143
2144 /* wake readers/writers/ioctl'ers */
2145 wake_up_interruptible(&video->waitq);
2146 }
2147
2148 out:
2149 spin_unlock(&video->spinlock);
2150 }
2151
2152 static struct cdev dv1394_cdev;
2153 static const struct file_operations dv1394_fops=
2154 {
2155 .owner = THIS_MODULE,
2156 .poll = dv1394_poll,
2157 .unlocked_ioctl = dv1394_ioctl,
2158 #ifdef CONFIG_COMPAT
2159 .compat_ioctl = dv1394_compat_ioctl,
2160 #endif
2161 .mmap = dv1394_mmap,
2162 .open = dv1394_open,
2163 .write = dv1394_write,
2164 .read = dv1394_read,
2165 .release = dv1394_release,
2166 .fasync = dv1394_fasync,
2167 };
2168
2169
2170 /*** HOTPLUG STUFF **********************************************************/
2171 /*
2172 * Export information about protocols/devices supported by this driver.
2173 */
2174 #ifdef MODULE
2175 static const struct ieee1394_device_id dv1394_id_table[] = {
2176 {
2177 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
2178 .specifier_id = AVC_UNIT_SPEC_ID_ENTRY & 0xffffff,
2179 .version = AVC_SW_VERSION_ENTRY & 0xffffff
2180 },
2181 { }
2182 };
2183
2184 MODULE_DEVICE_TABLE(ieee1394, dv1394_id_table);
2185 #endif /* MODULE */
2186
2187 static struct hpsb_protocol_driver dv1394_driver = {
2188 .name = "dv1394",
2189 };
2190
2191
2192 /*** IEEE1394 HPSB CALLBACKS ***********************************************/
2193
2194 static int dv1394_init(struct ti_ohci *ohci, enum pal_or_ntsc format, enum modes mode)
2195 {
2196 struct video_card *video;
2197 unsigned long flags;
2198 int i;
2199
2200 video = kzalloc(sizeof(*video), GFP_KERNEL);
2201 if (!video) {
2202 printk(KERN_ERR "dv1394: cannot allocate video_card\n");
2203 return -1;
2204 }
2205
2206 video->ohci = ohci;
2207 /* lower 2 bits of id indicate which of four "plugs"
2208 per host */
2209 video->id = ohci->host->id << 2;
2210 if (format == DV1394_NTSC)
2211 video->id |= mode;
2212 else
2213 video->id |= 2 + mode;
2214
2215 video->ohci_it_ctx = -1;
2216 video->ohci_ir_ctx = -1;
2217
2218 video->ohci_IsoXmitContextControlSet = 0;
2219 video->ohci_IsoXmitContextControlClear = 0;
2220 video->ohci_IsoXmitCommandPtr = 0;
2221
2222 video->ohci_IsoRcvContextControlSet = 0;
2223 video->ohci_IsoRcvContextControlClear = 0;
2224 video->ohci_IsoRcvCommandPtr = 0;
2225 video->ohci_IsoRcvContextMatch = 0;
2226
2227 video->n_frames = 0; /* flag that video is not initialized */
2228 video->channel = 63; /* default to broadcast channel */
2229 video->active_frame = -1;
2230
2231 /* initialize the following */
2232 video->pal_or_ntsc = format;
2233 video->cip_n = 0; /* 0 = use builtin default */
2234 video->cip_d = 0;
2235 video->syt_offset = 0;
2236 video->mode = mode;
2237
2238 for (i = 0; i < DV1394_MAX_FRAMES; i++)
2239 video->frames[i] = NULL;
2240
2241 dma_region_init(&video->dv_buf);
2242 video->dv_buf_size = 0;
2243 dma_region_init(&video->packet_buf);
2244 video->packet_buf_size = 0;
2245
2246 clear_bit(0, &video->open);
2247 spin_lock_init(&video->spinlock);
2248 video->dma_running = 0;
2249 mutex_init(&video->mtx);
2250 init_waitqueue_head(&video->waitq);
2251 video->fasync = NULL;
2252
2253 spin_lock_irqsave(&dv1394_cards_lock, flags);
2254 INIT_LIST_HEAD(&video->list);
2255 list_add_tail(&video->list, &dv1394_cards);
2256 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2257
2258 debug_printk("dv1394: dv1394_init() OK on ID %d\n", video->id);
2259 return 0;
2260 }
2261
2262 static void dv1394_remove_host(struct hpsb_host *host)
2263 {
2264 struct video_card *video, *tmp_video;
2265 unsigned long flags;
2266 int found_ohci_card = 0;
2267
2268 do {
2269 video = NULL;
2270 spin_lock_irqsave(&dv1394_cards_lock, flags);
2271 list_for_each_entry(tmp_video, &dv1394_cards, list) {
2272 if ((tmp_video->id >> 2) == host->id) {
2273 list_del(&tmp_video->list);
2274 video = tmp_video;
2275 found_ohci_card = 1;
2276 break;
2277 }
2278 }
2279 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2280
2281 if (video) {
2282 do_dv1394_shutdown(video, 1);
2283 kfree(video);
2284 }
2285 } while (video);
2286
2287 if (found_ohci_card)
2288 device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
2289 IEEE1394_MINOR_BLOCK_DV1394 * 16 + (host->id << 2)));
2290 }
2291
2292 static void dv1394_add_host(struct hpsb_host *host)
2293 {
2294 struct ti_ohci *ohci;
2295 int id = host->id;
2296
2297 /* We only work with the OHCI-1394 driver */
2298 if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2299 return;
2300
2301 ohci = (struct ti_ohci *)host->hostdata;
2302
2303 device_create(hpsb_protocol_class, NULL,
2304 MKDEV(IEEE1394_MAJOR,
2305 IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)),
2306 NULL, "dv1394-%d", id);
2307
2308 dv1394_init(ohci, DV1394_NTSC, MODE_RECEIVE);
2309 dv1394_init(ohci, DV1394_NTSC, MODE_TRANSMIT);
2310 dv1394_init(ohci, DV1394_PAL, MODE_RECEIVE);
2311 dv1394_init(ohci, DV1394_PAL, MODE_TRANSMIT);
2312 }
2313
2314
2315 /* Bus reset handler. In the event of a bus reset, we may need to
2316 re-start the DMA contexts - otherwise the user program would
2317 end up waiting forever.
2318 */
2319
2320 static void dv1394_host_reset(struct hpsb_host *host)
2321 {
2322 struct ti_ohci *ohci;
2323 struct video_card *video = NULL, *tmp_vid;
2324 unsigned long flags;
2325
2326 /* We only work with the OHCI-1394 driver */
2327 if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2328 return;
2329
2330 ohci = (struct ti_ohci *)host->hostdata;
2331
2332
2333 /* find the corresponding video_cards */
2334 spin_lock_irqsave(&dv1394_cards_lock, flags);
2335 list_for_each_entry(tmp_vid, &dv1394_cards, list) {
2336 if ((tmp_vid->id >> 2) == host->id) {
2337 video = tmp_vid;
2338 break;
2339 }
2340 }
2341 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2342
2343 if (!video)
2344 return;
2345
2346
2347 spin_lock_irqsave(&video->spinlock, flags);
2348
2349 if (!video->dma_running)
2350 goto out;
2351
2352 /* check IT context */
2353 if (video->ohci_it_ctx != -1) {
2354 u32 ctx;
2355
2356 ctx = reg_read(video->ohci, video->ohci_IsoXmitContextControlSet);
2357
2358 /* if (RUN but not ACTIVE) */
2359 if ( (ctx & (1<<15)) &&
2360 !(ctx & (1<<10)) ) {
2361
2362 debug_printk("dv1394: IT context stopped due to bus reset; waking it up\n");
2363
2364 /* to be safe, assume a frame has been dropped. User-space programs
2365 should handle this condition like an underflow. */
2366 video->dropped_frames++;
2367
2368 /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2369
2370 /* clear RUN */
2371 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
2372 flush_pci_write(video->ohci);
2373
2374 /* set RUN */
2375 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 15));
2376 flush_pci_write(video->ohci);
2377
2378 /* set the WAKE bit (just in case; this isn't strictly necessary) */
2379 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 12));
2380 flush_pci_write(video->ohci);
2381
2382 irq_printk("dv1394: AFTER IT restart ctx 0x%08x ptr 0x%08x\n",
2383 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
2384 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
2385 }
2386 }
2387
2388 /* check IR context */
2389 if (video->ohci_ir_ctx != -1) {
2390 u32 ctx;
2391
2392 ctx = reg_read(video->ohci, video->ohci_IsoRcvContextControlSet);
2393
2394 /* if (RUN but not ACTIVE) */
2395 if ( (ctx & (1<<15)) &&
2396 !(ctx & (1<<10)) ) {
2397
2398 debug_printk("dv1394: IR context stopped due to bus reset; waking it up\n");
2399
2400 /* to be safe, assume a frame has been dropped. User-space programs
2401 should handle this condition like an overflow. */
2402 video->dropped_frames++;
2403
2404 /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2405 /* XXX this doesn't work for me, I can't get IR DMA to restart :[ */
2406
2407 /* clear RUN */
2408 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
2409 flush_pci_write(video->ohci);
2410
2411 /* set RUN */
2412 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 15));
2413 flush_pci_write(video->ohci);
2414
2415 /* set the WAKE bit (just in case; this isn't strictly necessary) */
2416 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2417 flush_pci_write(video->ohci);
2418
2419 irq_printk("dv1394: AFTER IR restart ctx 0x%08x ptr 0x%08x\n",
2420 reg_read(video->ohci, video->ohci_IsoRcvContextControlSet),
2421 reg_read(video->ohci, video->ohci_IsoRcvCommandPtr));
2422 }
2423 }
2424
2425 out:
2426 spin_unlock_irqrestore(&video->spinlock, flags);
2427
2428 /* wake readers/writers/ioctl'ers */
2429 wake_up_interruptible(&video->waitq);
2430 }
2431
2432 static struct hpsb_highlevel dv1394_highlevel = {
2433 .name = "dv1394",
2434 .add_host = dv1394_add_host,
2435 .remove_host = dv1394_remove_host,
2436 .host_reset = dv1394_host_reset,
2437 };
2438
2439 #ifdef CONFIG_COMPAT
2440
2441 #define DV1394_IOC32_INIT _IOW('#', 0x06, struct dv1394_init32)
2442 #define DV1394_IOC32_GET_STATUS _IOR('#', 0x0c, struct dv1394_status32)
2443
2444 struct dv1394_init32 {
2445 u32 api_version;
2446 u32 channel;
2447 u32 n_frames;
2448 u32 format;
2449 u32 cip_n;
2450 u32 cip_d;
2451 u32 syt_offset;
2452 };
2453
2454 struct dv1394_status32 {
2455 struct dv1394_init32 init;
2456 s32 active_frame;
2457 u32 first_clear_frame;
2458 u32 n_clear_frames;
2459 u32 dropped_frames;
2460 };
2461
2462 /* RED-PEN: this should use compat_alloc_userspace instead */
2463
2464 static int handle_dv1394_init(struct file *file, unsigned int cmd, unsigned long arg)
2465 {
2466 struct dv1394_init32 dv32;
2467 struct dv1394_init dv;
2468 mm_segment_t old_fs;
2469 int ret;
2470
2471 if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2472 return -EFAULT;
2473
2474 if (copy_from_user(&dv32, (void __user *)arg, sizeof(dv32)))
2475 return -EFAULT;
2476
2477 dv.api_version = dv32.api_version;
2478 dv.channel = dv32.channel;
2479 dv.n_frames = dv32.n_frames;
2480 dv.format = dv32.format;
2481 dv.cip_n = (unsigned long)dv32.cip_n;
2482 dv.cip_d = (unsigned long)dv32.cip_d;
2483 dv.syt_offset = dv32.syt_offset;
2484
2485 old_fs = get_fs();
2486 set_fs(KERNEL_DS);
2487 ret = dv1394_ioctl(file, DV1394_IOC_INIT, (unsigned long)&dv);
2488 set_fs(old_fs);
2489
2490 return ret;
2491 }
2492
2493 static int handle_dv1394_get_status(struct file *file, unsigned int cmd, unsigned long arg)
2494 {
2495 struct dv1394_status32 dv32;
2496 struct dv1394_status dv;
2497 mm_segment_t old_fs;
2498 int ret;
2499
2500 if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2501 return -EFAULT;
2502
2503 old_fs = get_fs();
2504 set_fs(KERNEL_DS);
2505 ret = dv1394_ioctl(file, DV1394_IOC_GET_STATUS, (unsigned long)&dv);
2506 set_fs(old_fs);
2507
2508 if (!ret) {
2509 dv32.init.api_version = dv.init.api_version;
2510 dv32.init.channel = dv.init.channel;
2511 dv32.init.n_frames = dv.init.n_frames;
2512 dv32.init.format = dv.init.format;
2513 dv32.init.cip_n = (u32)dv.init.cip_n;
2514 dv32.init.cip_d = (u32)dv.init.cip_d;
2515 dv32.init.syt_offset = dv.init.syt_offset;
2516 dv32.active_frame = dv.active_frame;
2517 dv32.first_clear_frame = dv.first_clear_frame;
2518 dv32.n_clear_frames = dv.n_clear_frames;
2519 dv32.dropped_frames = dv.dropped_frames;
2520
2521 if (copy_to_user((struct dv1394_status32 __user *)arg, &dv32, sizeof(dv32)))
2522 ret = -EFAULT;
2523 }
2524
2525 return ret;
2526 }
2527
2528
2529
2530 static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
2531 unsigned long arg)
2532 {
2533 switch (cmd) {
2534 case DV1394_IOC_SHUTDOWN:
2535 case DV1394_IOC_SUBMIT_FRAMES:
2536 case DV1394_IOC_WAIT_FRAMES:
2537 case DV1394_IOC_RECEIVE_FRAMES:
2538 case DV1394_IOC_START_RECEIVE:
2539 return dv1394_ioctl(file, cmd, arg);
2540
2541 case DV1394_IOC32_INIT:
2542 return handle_dv1394_init(file, cmd, arg);
2543 case DV1394_IOC32_GET_STATUS:
2544 return handle_dv1394_get_status(file, cmd, arg);
2545 default:
2546 return -ENOIOCTLCMD;
2547 }
2548 }
2549
2550 #endif /* CONFIG_COMPAT */
2551
2552
2553 /*** KERNEL MODULE HANDLERS ************************************************/
2554
2555 MODULE_AUTHOR("Dan Maas <dmaas@dcine.com>, Dan Dennedy <dan@dennedy.org>");
2556 MODULE_DESCRIPTION("driver for DV input/output on OHCI board");
2557 MODULE_SUPPORTED_DEVICE("dv1394");
2558 MODULE_LICENSE("GPL");
2559
2560 static void __exit dv1394_exit_module(void)
2561 {
2562 hpsb_unregister_protocol(&dv1394_driver);
2563 hpsb_unregister_highlevel(&dv1394_highlevel);
2564 cdev_del(&dv1394_cdev);
2565 }
2566
2567 static int __init dv1394_init_module(void)
2568 {
2569 int ret;
2570
2571 cdev_init(&dv1394_cdev, &dv1394_fops);
2572 dv1394_cdev.owner = THIS_MODULE;
2573 ret = cdev_add(&dv1394_cdev, IEEE1394_DV1394_DEV, 16);
2574 if (ret) {
2575 printk(KERN_ERR "dv1394: unable to register character device\n");
2576 return ret;
2577 }
2578
2579 hpsb_register_highlevel(&dv1394_highlevel);
2580
2581 ret = hpsb_register_protocol(&dv1394_driver);
2582 if (ret) {
2583 printk(KERN_ERR "dv1394: failed to register protocol\n");
2584 hpsb_unregister_highlevel(&dv1394_highlevel);
2585 cdev_del(&dv1394_cdev);
2586 return ret;
2587 }
2588
2589 return 0;
2590 }
2591
2592 module_init(dv1394_init_module);
2593 module_exit(dv1394_exit_module);
Linux for Ginger Game Console